 | Boris Karloff als David Mallory |
 | Warren Hull als Jim Travers |
 | Jean Rogers als Joan Mallory |
 | Alan Baxter als John Baron aka The Kid |
 | Hobart Cavanaugh als Petty Louie |
 | Samuel S. Hinds als Steven Ranger |
 | David Oliver als Mike Callahan |
 | Ward Bond als Fingers |
 | Frank Reicher als Carl - gang engineer |
 | Edwin Maxwell als Lawyer Kruger |
 | George Cleveland als Sam Adams - Company Engineer (uncredited) |
 | Ruth Fallows als Waitress (uncredited) |
 | George Humbert als Mr. Spinelli (uncredited) |
| Nina Campana als Mrs. Spinelli (uncredited) |
 | Charles C. Wilson als Police Capt. Wallace (uncredited) |
 | Chuck Hamilton als Policeman (uncredited) |
| Jack Moffitt | Screenplay |
| Tristram Tupper | Screenplay |
| Lloyd Corrigan | Director |
| Jack Pierce | Makeup Artist |
| Robert Presnell Sr. | Producer |
| George Robinson | Director of Photography |
| William A. Pierce | Story |
| Loren Patrick | Art Direction |
| John P. Fulton | Special Effects |
| Otis Garrett | Editor |
| Jack Otterson | Art Direction |
| Jesse Bastian | Sound |
| Jess Moulin | Sound |
| Gilbert Kurland | Sound Supervisor |
| John P. Fulton | Visual Effects |
| Karl Hajos | Music |
| Charles Maxwell | Music |
| Arthur Morton | Music |
| Charles Previn | Music |
| David Raskin | Music |
| Heinz Roemheld | Music |
| Clifford Vaughan | Music |
| Edward Ward | Music |
| Franz Waxman | Music |
